恩施野生川续断的硒含量与富硒特征

Selenium Contents and Characteristics of Selenium Enrichment of Wild Dipsacus asperoides in Enshi

为了认识恩施野生川续断的硒含量及其富硒特征,在恩施地区8个不同硒含量地点采集了川续断植株及其生长地的土壤样品,运用氢化物发生原子荧光法测定了川续断根、茎、叶、花和土壤样品的硒含量,分析了野生川续断的富硒特征。结果表明:①供试川续断样品根、茎、叶、花和土壤样品的硒含量变化范围分别为0.029~94.87、0.008~39.45、0.040~123.14、0.026~143.94和0.6~277.3mg/kg,且不同部位的硒含量与土壤硒含量均呈极显著的线性相关;②供试川续断样品对硒的生物富集系数和转运系数分别为0.012~0.727和0.279~2.200,均以茎最低;③根据川续断对硒的转运系数可以将所采集的川续断样品分为叶富集型和花富集型,低硒土壤环境下,川续断为叶富集型,高硒土壤环境下,川续断为花富集型;④恩施野生川续断在高硒土壤环境中仍能正常生长,具有较强的富集土壤硒的能力,应属于聚硒植物。本结果对川续断在富硒环境下的培育和开发具有实际意义。

In order to understand selenium content and characteristics of selenium enrichment of wild Dipsacus asperoides in Enshi of Hubei Province,samples of Dipsacus asperoides and their homologous soils were collected from eight different regions.Hydride generation atomic fluorescence spectrometric method was used to measure selenium contents in roots,stems,leaves and flowers of Dipsacus asperoides,and in soil samples.The ranges of selenium contents in roots,stems,leaves and flowers of Dipsacus asperoides and in soil samples were 0.029-94.87,0.008-39.45,0.040-123.14,0.026-143.94 and 0.6-277.3 mg/kg,respectively.Significant linear correlation were found between selenium contents in roots,stems,leaves and flowers of Dipsacus asperoides and in soil samples.Selenium bio-concentration factor and transport factor of Dipsacus asperoides were 0.012-0.727 and 0.279–2.200,respectively.The two coefficients were the lowest in stems.Based on selenium transport factor,the samples of Dipsacus asperoides were divided into two types:Leaf enrichment(LE)which was in low soil selenium content and flower enrichment(FE)which was in high soil selenium content.The results revealed that Dipsacus asperoides is a plant species of selenium enrichment because it can grow normally in soil with high selenium content and has strong capability of selenium enrichment.This study has practical significance to breed and develop Dipsacus asperoides in selenium enriched environment.